Definitely not Bi [MM]

I (m25) have been on the fence about being bi for the past 7 years. Sure I’m attracted to twinks and femboys but not much else. Well I decided to finally find out, the hard way. I’d been talking to a friend I made on grinder a few years ago and decided to say fuck it and let him fuck me.
It was pretty late at night when he was texting me and I was especially horny. An hour of talking passes and eventually I decide to go to his place to hang out and fuck. I thought I wad going to be the top but he wanted to try me out so I agreed. Once cleaned up I laid down and let him get on top and kiss me. We made out for a while while I slapped his ass and he grinded On my leg. Finally I got on the edge of the bed, face down ass up and let him have his way with mu tight hole. He wasn’t the biggest so it was pretty easy for my first time, he fucked me hard and moanded like crazy, apparently I was tight as hell and he loved it. I was bored… after a while he got tired and then I got on top and fucked him nice and hard while slapping his ass, choking him and scratching his back, he loved it nice and rough. He was maoning how much he liked it and that sent me over the edge and I shot a huge load into his ass.